Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong SiAdopts UHF technology, remote wireless transmission makes operation easier without annoying wires, can achieve 20m of the transmission distance. Broader frequency range, less interference, showing your voice easily and perfectlyAdopts the exacting complete electronic circuit control, capture , full-bodied sound from sources are directly in front of the microphone. For all events like Karaoke, live-performances, conference, church, school, hall, party, etc.USB receiver supply by USB charger,powbank and more.Suitable for studio / karaoke / radio / etcV20:frequency: A:262.85MHz B:268.85MHzdistance: 30-50sPCB board: +5-9VAudio frequency response: 40HZ~15KHZAudio dynamic range: more than 100dBAudio output: 0-200mvMaximum operating distance: more than 80 meters/mReceiver supply voltage: 3.7v-4.2v (lithium battery)Receiver working current: less than 80mAReceiver continuous working time: standard (3.7v/800mA) 10 hoursTransmitter working current: less than 80mATransmitter working time: 10-18 hoursColor: blackMaterial: plasticSize: 250x50mmPackage Contents:1 x pair of microphones1 x adapter1 x connection line1 x receiver (Without battery)Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.